This change adds support for `*.cjs` config files by removing the
explicit use of `searchPlaces` options and relying and the default
search places generated by `cosmicconfig`. As per the docs for
[`cosmicconfig`][cc], the defaults include all the extensions/formats
previously supported by semantic-release in addition to the new .cjs
variants.
Resolves [#1814][issue].
[issue]: https://github.com/semantic-release/semantic-release/issues/1814
[cc]: https://github.com/davidtheclark/cosmiconfig#searchplaces
3ecc196d8a